update2_tamu.php

<?php
include "koneksi.php";//sambung ke mysql

//mengambil nilai dari form
$id_tamu=$_POST['id_tamu'];
$nama = $_POST['nama'];
//$alamat = $_POST['alamat'];

$update = mysql_query("UPDATE tes SET nama WHERE id_tamu = '$id_tamu'");

if ($update){
//echo "sukses update data";
?><script>document.location.href="tampil_tamu.html"</script><?php
}else{
echo "gagal : ".mysql_error();
}
?>